Rotary pump for air, water, &amp; c.



No. 666,588. Patanted Jan. 22, I90l. J. A'ITKEN.

ROTARY PUMP FOR AIR, WATER, 8w.

(Application filed May 28, 1900.)

(No Model.) 5 Sheets-Sheet l.

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nomzv PUMP FOB AIR, WATER, ac. (#pplicstion fllod lhy 98, 1900.)

(No Model.) 5 Sheetr-Sheat 2.

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ROTARY PUMP FOR AIR, WATER, 6L0.

(Application filed. my 28, 1900.)

(No Model.)

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IHHI-I ll No. 666,588. Patented Jan. 22, I90I.

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ROTARY PUMP FOR AIR, WATER, &c.

(Application filed May 28, 1900.) (No Model.) 5 Sheets-$heet 4.

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No. 666,588. Patented Jan. 22, l90l.

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ROTARY PUMP Fun AIR, WATER, GL0.

(Application fil ad my 28, 1900.) (No Model.) 5 Shaets8heet 5.

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UNITED STATES ATENT ge cs JAMES AITKEN, OF THE BREAKWATER, NEAR GEELONG, VICTORIA.

ROTARY PUMP FOR AIR, WATER, 840..

SPECIFICATION forming part of Letters Patent No. 666,588, dated January 22, 1901.

Application filed May 28, 1900. semi No. 18,839. Lllo model.)

To all whom, it may concern:

Be it known that I, JAMES AITKEN, engineer, a subject of the Queen of Great Britain, residing at the Breakwater, near Geelong, in the British Colony of Victoria, have invented an Improved Rotary Pump for Air,

Water, or other Fluids, of which the follow ing is a specification.

This invention has been devised in order to provide a rotary pump for air, water, or other fluids which will give a high efficiency with a minim um expenditure of power and which will not be liable to get out of order.

I11 order that my invention may be readily understood, I will describe it by reference to the accompanying drawings, in which Figure 1 represents a side elevation, and Fig. 2 an end elevation, of my improved rotary pump. Fig. 3 is a vertical central longitudinal section on line 3 3, Fig. 2; and Fig. 4 is a vertical longitudinal section'on line 4 4:, Fig. 2. Fig. 5 is a horizontal section of the machine on line 5 5, Figs. 1 and 2. Fig. 6 is a vertical transverse section on line 6 6, Fig.

1. Figs. 7 and 8 are a plan and section of a detail hereinafter described.

The same letters of reference indicate the same parts in all the figures.

My improved rotary pump for air, water, or other fluids consists, by preference, of a double casing or two casings A A in open communication laterally with each other through a passage a, extending from end to end of the inner or adjacent walls of the easings. Each of these casings is fitted with a screw B B of such a diameter as to form a working fit within the casings, and each of said screws is formed with, by preference, deep square threads, as shown, although, if found more convenient, other descriptions of threads may be employed. These screws B and B are mounted upon or provided with spindles b b, and these spindles are fitted with spur-wheels O O',gearing into each other, so that the two screws B B will always revolve synchronously when the requisite motionis imparted to one of said spindles by means, for instance, of a belt working around a pulley, such as D, thereupon.

E represents an inlet for the water, air, or other fluid, which is provided at one end of the casing or casings of the pump and which is in open communication with the inlet ends of both casings, while F represents an outlet, which is in correspondingly-open communication with the other ends thereof, a port or passage 6 being provided to connect the outlet ends of said casings, as shown.

In order to insure the water, air, or other fiuid passing along'the casings instead of going direct from the inlet E to the outlet F, I divide the upper halves of the casings from the lower halves, thereby preventing the water passing around the threads without being propelled forwardly. I accom plish this result by means of an endless traveling chain or series of traveling fingers or stop-pieces G, arranged to enter the space between the casings at one end and to move along between the two screws B B until it passes out of the casings at the opposite end subsequently returning to the starting-point along a passage or way H, which extends over the pump, as shown. The fingers or stops G are made of flat pieces of metal or other suitable material, with lugs g on the side to enable them to be connected together into a chain, as shown, by means of pins passing through said lugs, or the whole series might be constructed of some flexible material after the manner of a bandsaw, for instance. These said fingers or stoppieces are arranged to correspond with the pitch of the screws B B and to fit closely into the spaces between the threads thereof. They are preferably constructed of two plates of metal or other suitable material clamped together, with leather or other packing material g between them. vided in the passage or way H to allow the chain of stop-pieces or fingers to pass through while maintaining a tight joint around them. Antifriction-rollers or other supports may be provided within the passage H to support and guide the chain of fingers or stop-pieces within the casing. Other stuffing-boxes b are provided and suitably connected to the easings for the spindles or shafts Z) I) of the screws B B. These screws B B are preferably made to taper slightly, like the plug of an ordinary valve or cook, set-screws b being used for adjusting them as they become worn, and the threads are made of graduallydecreasing depth toward the discharge ends of the screws, as indicated at b that is, the

A stuffing-box I is pro-- 7 ing, when it escapes through the outlet-port central parts of the screws are gradually increased in diameter toward said endsthe effect being to force the water or other fluid outward with gradually-increasing force. An internal annular recessf is formed in the discharge ends of the casings to facilitate the discharge of the water or other fluid.

If desired,only one casing and screw can be used,instead of having a pair of them arranged side by side, as shown, in which case the traveling fingers or stops will be arranged to travel along one side of the casing and to project into the spaces between the threads of the screw on one side, the opposite side of the chain of stops being left plain and arranged to work in a groove in the side of the casing.

In operation motion is imparted to the screws B B, as above described, the effect be ing to draw water or other fluid into the casings A A through the inlet-port E. The fingers or stops G prevent this water or other fluid passing around the threads, and consequently compel it to move along to the opposite end of the casingthat is, it is drawn along said casings by means of said screws until it reaches the opposite end of the eas- F. In thisway the water or other fluid can be raised to considerable heights with a minimum expenditure of power.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim'is 1. In a rotary pump for air, water or other fluid, a casing provided with suitable inlet:

and discharge ports, a pair of spindles arranged in said casing and each of which is provided with screw-threads of gradually-decreasingdepth toward the discharge end thereof, a passage or way H connected to said casing, and a continuous belt of traveling stops or fingers arranged in the said way and cas- ,to by the said threads, as and for the purpose set forth.

3. In a rotary pump for air, water or other fluids, the combination with a casing having an internal annular recess at its discharge end, of a pair of screws provided with threads of grad ually-decreasing depth toward the discharge end thereof, and a suitably-arranged continuous series of stops or fingers adapted to engage and have motion imparted thereto by the said threads, as and for the purpose set forth.

JAMES AITK-EN.

Witnesses:

EDWARD WATERS, EDWARD WATERS, J r. 

